Iso: Royal Icing Made With Powdered Egg Whites

I am looking for a recipe for royal icing that's made with powdered egg whites - not meringue powder or liquid egg whites. Powdered egg whites are a lot cheaper than meringue powder and I hate the waste associated with using regular egg whites (unless I need the yolks for pastry cream or something else).

I hear making royal icing with egg albumin powder is big in Europe, but I can't seem to find any recipes for the stuff.